Yes as Andrew says - a device with a bridge mode.
I believe these types of things can do bridging, but best to check the manuals for modes showing it connecting to another access point (acting as a client / station)
the latter has the lowest bandwidth on paper but has additional LAN ports (and a spectrum analyser)
prompt $P - Invalid drive specification - Abort, Retry, Fail? $G
prlzx on n e w n e t: ADSL2+ / 21CN at 2.5Mbps / 800k